Video display apparatus
An image display device and image technology, which are applied in image communication, static indicators, cathode ray tube indicators, etc., can solve the problems of no or little improvement of apparent brightness, dark images, etc., to prevent the degradation of image quality. , the effect of suppressing power consumption and improving brightness
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Embodiment 1
[0030] image 3 is a block diagram showing a PDP display device according to an embodiment of the present invention. In the figure, the image processing circuit 521 includes a brightness modulation circuit that performs brightness modulation processing (hereinafter, sometimes referred to as “brightness reduction processing of the peripheral portion of the screen”) to reduce the brightness of the peripheral portion of the screen. Separation circuit 521 1 and multiplication circuit 521 2 constitute. The system control device (hereinafter referred to as "CPU") 522 controls the processing of the image signal and is composed of a microcomputer or the like. The data memory 523 stores brightness compensation data (described later) and the like. In addition, the image processing circuit 521 also has a function of outputting the timing of the received signal to the CPU 522 in addition to processing to reduce the brightness of the peripheral portion of the screen. In this embodimen...
Embodiment 2
[0062] Next, we describe the second embodiment. Figure 6 (b) is the characteristic of the compensation gain α related to the second embodiment.
[0063] In relation to the first embodiment Figure 6 In the characteristic 831 of the compensation gain α of (a), the APC signal S apc The value of D as a boundary, the compensation gain α shifts (changes) sharply from 1 to α xy , or from α xy Migrate (change) to 1. Here, if the APL value of the image signal S3 changes around A, because the APC signal S apc It also changes around the value D, so the compensation gain α is between 1 and α xy change between. Therefore, the fluctuation frequency of whether or not the luminance of the peripheral portion of the screen decreases increases, so that the viewer may easily recognize the luminance fluctuation, and image characteristics may be significantly deteriorated.
[0064] The second embodiment is an example of reducing this inappropriate situation. In the compensation gain charac...
Embodiment 3
[0079] Next, we use Figure 8 , Figure 9 A third embodiment of the present invention will be described. This embodiment is through the setting of the device structure, even if the APC signal S cannot be converted as in the first embodiment apc From image 3 In the case where the APC circuit 324 of the APC circuit 324 is fed back to the CPU 522, an embodiment in which the brightness reduction of the peripheral portion of the screen can be controlled correspondingly to the displayed image can also be used.
[0080] Figure 9 It is a block diagram showing the PDP display device of the third embodiment. In this figure, a display / drive control circuit 322, a PDP 323, an APC circuit 324, a power supply circuit 325, an image processing circuit 521, a CPU 522, and a data memory 523 have the same image 3 A circuit or display panel with the same function. In addition, the APL detection circuit 1021 detects the APL of the input image signal S1.
[0081] In this configuration, th...
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